error threshold

Compiled with AI assistance and selectively reviewed. Please consult the cited passages; the books remain the authoritative source. About this companion

Editorial synthesis · provisional

Definition

The error threshold is the mutation-rate limit, presented through Eigen’s quasispecies model, beyond which copying errors undermine the retention of genetic information. The corpus places this upper boundary within a broader argument that adaptation needs variation without informational collapse. Its additional contrast with insufficient mutation is an explanatory productive-band framing, not a second universally specified numerical threshold or an identity with hormesis.

Explanation

RB1 compresses the example into the contrast between too little variation and error catastrophe. RB3 clarifies the lower-side reasoning: perfectly accurate copying produces no new mutational variation, so adaptive change can stall after existing variation is exhausted. This qualification avoids claiming that every instance of adaptation immediately ceases whenever a mutation rate is zero.

The named theoretical route is Eigen’s model, retained through its native reference and RB3’s later note. The entry does not invent a universal mutation rate, a species-independent formula or an experimentally measured limit absent from the local explanation. The technical upper-bound idea and the author’s broader balance argument remain distinguishable.

Although the brief RB1 gloss calls the example hormesis at genomic scale, its subsequent methodological caution denies identical mechanisms or mathematics. That explicit limit governs the synthesis: dose response and information retention can play analogous roles in the book’s organizing pattern without being one biological process.

Scope and attribution

Preserve model scope and the explicit qualification concerning existing variation; supply no absent numeric boundary.

PB — The Possible Book

Source-verified occurrence; see the printed-page references below.

Occurrence locators: 94.

RB1 — The Real Book, Volume I: The Possible Is Real

Eigen’s error threshold is used in a broader low-variation/high-error comparison.

Occurrence locators: 134, 135, 137.

RB3 — The Real Book, Volume III: Murmurations

The exhausted-existing-variation qualification sharpens the zero-mutation contrast.

Occurrence locators: 72, 73.

Background used in the editorial explanation

Named theories and mechanisms are distinguished from neighboring background, homonyms and the author’s own synthesis. Reproduced AI passages retain their separate voice.